This can be used when connecting a laptop to a better monitor without using the laptop's built-in screen. SCREEN SHOWS VIDEO FOR A SECOND THEN GOES OFF, AUDIO IS STILL WORKING - Logo, No picture.In my office, I am using an external monitor as my main screen for my MacBook Pro. Today, the screen didn’t respond when I connected my MacBook however : the screen stays black and nothing appears on-screen. So I opened up my MacBook and used the built-in screen to figure out what’s wrong, but so far I haven’t found any indication in the Displays Preference Panel that my MacBook even detects the second screen…The other monitors will stay powered on but only show black or not display a video signal at all. DOES NOT TURN ON - No picture, Not working, LED turns on. (StarTech.com product ID for the USB-C to HDMI 2.0 cable: CDP2HD4K60.) If you are using a dual monitor setup, connect a dual DisplayPort adapter from the USB-C Thunderbolt 3 port on the docking station to the DisplayPort. Connect a USB-C to HDMI 2.0 cable from the USB-C Thunderbolt 3 port on the docking station to the HDMI input on the display.if you are using a MacBook, MacBook Air or MacBook Pro, make sure you have the power adapter connectedJan 26, 2009. I guess the only thing that's left to do is to do the 'cheap. And if both monitors are mirrored it turns the second one black which is my Android monitor.
in the Display Preferences window, see if there is a button marked “Gather Windows” bottom right in the System Preferences window, select “Displays” on your MacBook, open Apple –> System Preferences Spotify for mac app storefirst, press the ALT-key on your keyboard and a button marked “Detect Displays” appears where the “Gather Windows”-button used to be click on it when it appears select the Display Preference window that has 3 tabs on it marked “Display”, “Arrangement” and “Color” (not the window that has “Display” and “Color” only) then you will see 2 Display Preference windows on your MacBook screen if there is a “Gather Windows” button, click on it reconnect your Mac to your monitor using a different type of cable then you normally would choose (e.g. if your monitor switches on now, uncheck the “Mirror Display” option again and close your MacBook… you should be good now… click on the “Arrangement”-tab and in the next window put a checkmark at “Mirror Display”
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